Rpm sensor for electronic motor braking

H - Electricity – 02 – P

Patent

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Details

318/86

H02P 3/24 (2006.01) H02P 3/26 (2006.01)

Patent

CA 1185316

ABSTRACT OF THE DISCLOSURE The motor braking circuit for use with an alter- nating current motor and an AC power source includes a power circuit for supplying a DC braking current to the AC motor and a motor speed sensor which causes a mechanical brake to engage the AC motor and its load when the motor speed decreases to a predetermined value. The DC braking current is applied to start the electrical braking cycle as soon as the AC source is disconnected from the AC motor. The RPM sensor monitors the speed of the AC motor during the electronic braking cycle and causes the mechanical brake to engage the motor and its load when the motor speed decreases to a predetermined value to complete the stopping sequence. The AC motor braking system can be installed without any additional direct wiring or additional hardware to the AC motor.

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